dependency `glad` should be declared in CMakeLists.txt

[milahu]

when /usr/include/glad/glad.h is not installed (for example on nixos), cmake fails with

[ 50%] Building C object CMakeFiles/freetype-gl.dir/texture-atlas.c.o
In file included from /build/freetype-gl/text-buffer.c:12:
/build/freetype-gl/opengl.h:10:13: fatal error: glad/glad.h: No such file or directory
   10 | #   include <glad/glad.h>
      |             ^~~~~~~~~~~~~
compilation terminated.

see conan-io/conan#8875

[rougier]

Thanks for the report. Would you have a fix?

[milahu]

nope, sorry ... https://www.google.com/search?q=Dav1dde%2Fglad+cmake+find_package

[rougier]

That's annoying. I'll leave the issue open until someone can fix it.

[zengxiuhao]

you can add glad.h and khrplatform.h and glad.c 。
replace opengl.h with glad.h
that it's ok